Yep, Hypua Flyoae AA-A h83 is a nebula. One of the faint ones, but still one. There's a rather easy way to tell: they get a label on the galaxy map. There's also the Hypua Flyoae AA-A h52 nebula nearby.
Procedurally generated large nebulae have the system name as a label, procedurally generated planetary nebulae get "[center system name] Nebula" as a name. That distinction is a bit weird, but it is what it is. (As an interesting trivia, the planetary nebulae as objects are also untargetable-in-cockpit virtual systems like the centers of large nebulae, they are just in the same position as the actual system that you can visit. For example, Thraikoo PS-U e2-4 is the center system, Thraikoo PS-U e2-5 is the planetary nebula.)